Capture Error ASN0005E

Hi,
I have to start replication between two DB2 db's in cold mode. I'm getting the following error.
I have manually refreshed the subscription sets as well. still getting the same error.
Error Message:
ASN0005E CAPTURE "CAPREPT" : "WorkerThread". The Capture program encountered an er
ror when reading the DB2 log. The log sequence number is "0000:0000:0000:0000:0000", the SQLCODE is "-2018", and the reason code is "".

SQL2018N The utility encountered an error "<error>" while attempting to
verify the user's authorization ID or database authorizations.

Explanation:

The user attempted to execute a utility and one of the following has
occurred:
* The user authorization ID is not valid.
* An error occurred attempting to access the user's authorizations for
the database.

The utility stops processing.

User response:

Look at the error number in the message for more information. Make
changes and resubmit the command.

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